WOW....I honestly can't believe someone has done that. Easy to fit...I think lag would be tremendous.
that setup looks quite interesting. I think i will get pulled over by EPA driving with it every day. lol. But I'm more thinking of the battery tray area.
That would be horribly inefficient as the exhaust gases would be way to cold by the time they reach the turbo. These people obviously know nothing about thermodynamics...
With the VG motor I doubt that there will be room for a big single turbo, not even at the front. Big single like a GT35R will work quite well despite what the TT slaves say but you can only fit what the space allows. Single turbo straight six or NA Nissan V8 FTW.
Exactly...the higher the exhaust velocity, the faster the turbo will spool up. The further away from the exhaust ports, the cooler the gas will become and it's velocity will slow right down, hence the turbo will spool slower and your back pressure will increase dramatically. You want to fit your turbo as close a feasibly possible to your exhaust ports. How they can claim that setup isn't laggy is beyond me.
I'm assuming your wanting to make a conversion kit for your business, so this probably won't be of much help to you. The Nissan Cima Y31 uses a VG30DET motor. Stock, it has 25hp less than the VG30DETT, which doesn't sound too bad. If you really want a single turbo Z32 i think buying a halfcut of the Cima and doing a conversion might be the way (the cheapest way anyway).
Correct Correct, and another consideration is exhaust pulse intensity, the closer to the head the further apart and stronger the exhaust pulses are, that why in theory a twin turbo set up is more efficient throughout most of the rev range, compared to a single turbo
Not sure about the theory but heat losses from two turbos will be greater than from one, all other things being equal. And heat = power of course. Plus you get that destructive extra engine bay heat from two.
So you are trying to say the the total exhaust air pressure at as it exists the cylinder is different to the total exhaust pressure as it leaves the exhaust tip out of the car?
I never said heat = power. In this case heat = velocity. Higher temp gases are less dense and will have a greater velocity than a cooler gas will. So as it cools it will slow down.It's not necesarily pressure we're talking about. Turbo's rely on the velocity of the exhaust gases to spool up. Hence why turbo manifolds are designed generally with a slightly smaller ID in order to achieve a higher velocity of the exhaust gases. And yes I am saying that if you place your turbo on your manifolds like your supposed too then the pressure will be much higher there than if you stuck it on the end of the exhaust. Why?? Because by this point the gas has cooled substancially and is much more dense, therefore not taking up as much volume in the exhaust, so less pressure.
I never said you did.. Heres what the manufactures are saying... http://www.ststurbo.com/f_a_q "No, our turbochargers are sized to operate at this remote location. Just like any turbocharger, once the turbo is up to temperature and in the rpm range for which it was designed to operate. The boost comes on hard and fast. All of our systems will produce full boost below 3000 rpm. If you were to take a conventional turbo and place it at the rear, you would have lots of lag and consequently, our turbo wouldn't work properly if mounted up front. Our systems compress the intake tubing in about .05 seconds. So much for turbo lag... No, heat doesn't create velocity. Heat creates volume. If you look at any of the physics laws for gasses, you will find that pressure and volume and heat are related. PV=NRT is a popular one, The V isn't for velocity, it is for Volume."
PV=NRT is the IDEAL gas equation... Go and find a thermo text book and pay attention to the steam tables, hours of fun for the whole family Turbines are more effiecient with hot gasses, something to do with the specific entropy of the gas, can't remember exactly what, that was ages ago
Efficienty due to heat is dependant on design.. designed to run at certain temperatures.. Heat increases volume.. Volume increases pressure.. Pressure increases performance.. If you could increase the volume without heat it would have the same effect.. what does NOS do ??? Introduces more Volume to the cylinders...
well, not only does nos induce more volume, it also contaisn significantly more oxygen than normal air hence fuel can burn far more efficently and hence create more power
Bottom line bottom line, the exhaust gas has cooled and slowed down significantly by the time it reaches the back of the car, and as i said earlier the turbine wheel prefers strong seperate exhaust pulses for fast spooling, so a turbo will not be as efficient by any means at the back of the car.
